Free license or?

New to this world of HISE... Just have one question. Since not everybody has Native Instruments Kontakt, I was wondering putting together a FREE series of sample libraries made with HISE, where people can use or redistribute the samples (so called royalty free in any way possible hehe). My question is: Can i do that with the free license without getting a commercial license???

As long as your project respects the requirement of the GPL v3 license, you don't need a commercial license. So in your case, just put the project folder on GitHub (or somewhere else), make the samples / other assets accessible to the public and start distributing the binary.

You can even sell the binary to end users as long as people have the ability to build the full product themselves.